Timo Kösters
4 years ago
8 changed files with 364 additions and 11 deletions
@ -0,0 +1,215 @@
@@ -0,0 +1,215 @@
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use super::super::Config; |
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use crate::{utils, Result}; |
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use std::{future::Future, pin::Pin, sync::Arc}; |
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use super::{DatabaseEngine, Tree}; |
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use std::{collections::HashMap, sync::RwLock}; |
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pub struct Engine { |
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rocks: rocksdb::DBWithThreadMode<rocksdb::MultiThreaded>, |
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old_cfs: Vec<String>, |
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} |
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pub struct RocksDbEngineTree<'a> { |
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db: Arc<Engine>, |
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name: &'a str, |
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watchers: RwLock<HashMap<Vec<u8>, Vec<tokio::sync::oneshot::Sender<()>>>>, |
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} |
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impl DatabaseEngine for Engine { |
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fn open(config: &Config) -> Result<Arc<Self>> { |
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let mut db_opts = rocksdb::Options::default(); |
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db_opts.create_if_missing(true); |
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db_opts.set_max_open_files(16); |
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db_opts.set_compaction_style(rocksdb::DBCompactionStyle::Level); |
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db_opts.set_compression_type(rocksdb::DBCompressionType::Snappy); |
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db_opts.set_target_file_size_base(256 << 20); |
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db_opts.set_write_buffer_size(256 << 20); |
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let mut block_based_options = rocksdb::BlockBasedOptions::default(); |
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block_based_options.set_block_size(512 << 10); |
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db_opts.set_block_based_table_factory(&block_based_options); |
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let cfs = rocksdb::DBWithThreadMode::<rocksdb::MultiThreaded>::list_cf( |
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&db_opts, |
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&config.database_path, |
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) |
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.unwrap_or_default(); |
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let db = rocksdb::DBWithThreadMode::<rocksdb::MultiThreaded>::open_cf_descriptors( |
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&db_opts, |
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&config.database_path, |
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cfs.iter().map(|name| { |
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let mut options = rocksdb::Options::default(); |
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let prefix_extractor = rocksdb::SliceTransform::create_fixed_prefix(1); |
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options.set_prefix_extractor(prefix_extractor); |
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options.set_merge_operator_associative("increment", utils::increment_rocksdb); |
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rocksdb::ColumnFamilyDescriptor::new(name, options) |
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}), |
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)?; |
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Ok(Arc::new(Engine { |
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rocks: db, |
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old_cfs: cfs, |
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})) |
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} |
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fn open_tree(self: &Arc<Self>, name: &'static str) -> Result<Arc<dyn Tree>> { |
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if !self.old_cfs.contains(&name.to_owned()) { |
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// Create if it didn't exist
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let mut options = rocksdb::Options::default(); |
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let prefix_extractor = rocksdb::SliceTransform::create_fixed_prefix(1); |
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options.set_prefix_extractor(prefix_extractor); |
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options.set_merge_operator_associative("increment", utils::increment_rocksdb); |
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let _ = self.rocks.create_cf(name, &options); |
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println!("created cf"); |
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} |
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Ok(Arc::new(RocksDbEngineTree { |
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name, |
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db: Arc::clone(self), |
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watchers: RwLock::new(HashMap::new()), |
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})) |
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} |
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fn flush(self: &Arc<Self>) -> Result<()> { |
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// TODO?
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Ok(()) |
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} |
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} |
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impl RocksDbEngineTree<'_> { |
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fn cf(&self) -> rocksdb::BoundColumnFamily<'_> { |
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self.db.rocks.cf_handle(self.name).unwrap() |
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} |
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} |
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impl Tree for RocksDbEngineTree<'_> { |
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fn get(&self, key: &[u8]) -> Result<Option<Vec<u8>>> { |
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Ok(self.db.rocks.get_cf(self.cf(), key)?) |
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} |
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fn insert(&self, key: &[u8], value: &[u8]) -> Result<()> { |
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let watchers = self.watchers.read().unwrap(); |
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let mut triggered = Vec::new(); |
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for length in 0..=key.len() { |
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if watchers.contains_key(&key[..length]) { |
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triggered.push(&key[..length]); |
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} |
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} |
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drop(watchers); |
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if !triggered.is_empty() { |
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let mut watchers = self.watchers.write().unwrap(); |
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for prefix in triggered { |
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if let Some(txs) = watchers.remove(prefix) { |
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for tx in txs { |
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let _ = tx.send(()); |
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} |
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} |
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} |
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} |
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Ok(self.db.rocks.put_cf(self.cf(), key, value)?) |
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} |
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fn insert_batch<'a>(&self, iter: &mut dyn Iterator<Item = (Vec<u8>, Vec<u8>)>) -> Result<()> { |
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for (key, value) in iter { |
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self.db.rocks.put_cf(self.cf(), key, value)?; |
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} |
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Ok(()) |
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} |
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fn remove(&self, key: &[u8]) -> Result<()> { |
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Ok(self.db.rocks.delete_cf(self.cf(), key)?) |
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} |
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fn iter<'a>(&'a self) -> Box<dyn Iterator<Item = (Vec<u8>, Vec<u8>)> + 'a> { |
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Box::new( |
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self.db |
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.rocks |
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.iterator_cf(self.cf(), rocksdb::IteratorMode::Start) |
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.map(|(k, v)| (Vec::from(k), Vec::from(v))), |
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) |
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} |
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fn iter_from<'a>( |
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&'a self, |
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from: &[u8], |
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backwards: bool, |
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) -> Box<dyn Iterator<Item = (Vec<u8>, Vec<u8>)> + 'a> { |
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Box::new( |
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self.db |
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.rocks |
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.iterator_cf( |
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self.cf(), |
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rocksdb::IteratorMode::From( |
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from, |
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if backwards { |
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rocksdb::Direction::Reverse |
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} else { |
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rocksdb::Direction::Forward |
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}, |
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), |
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) |
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.map(|(k, v)| (Vec::from(k), Vec::from(v))), |
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) |
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} |
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fn increment(&self, key: &[u8]) -> Result<Vec<u8>> { |
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// TODO: make atomic
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let old = self.db.rocks.get_cf(self.cf(), &key)?; |
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let new = utils::increment(old.as_deref()).unwrap(); |
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self.db.rocks.put_cf(self.cf(), key, &new)?; |
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Ok(new) |
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} |
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fn increment_batch<'a>(&self, iter: &mut dyn Iterator<Item = Vec<u8>>) -> Result<()> { |
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for key in iter { |
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let old = self.db.rocks.get_cf(self.cf(), &key)?; |
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let new = utils::increment(old.as_deref()).unwrap(); |
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self.db.rocks.put_cf(self.cf(), key, new)?; |
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} |
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Ok(()) |
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} |
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fn scan_prefix<'a>( |
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&'a self, |
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prefix: Vec<u8>, |
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) -> Box<dyn Iterator<Item = (Vec<u8>, Vec<u8>)> + 'a> { |
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Box::new( |
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self.db |
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.rocks |
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.iterator_cf( |
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self.cf(), |
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rocksdb::IteratorMode::From(&prefix, rocksdb::Direction::Forward), |
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) |
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.map(|(k, v)| (Vec::from(k), Vec::from(v))) |
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.take_while(move |(k, _)| k.starts_with(&prefix)), |
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) |
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} |
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fn watch_prefix<'a>(&'a self, prefix: &[u8]) -> Pin<Box<dyn Future<Output = ()> + Send + 'a>> { |
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let (tx, rx) = tokio::sync::oneshot::channel(); |
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self.watchers |
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.write() |
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.unwrap() |
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.entry(prefix.to_vec()) |
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.or_default() |
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.push(tx); |
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Box::pin(async move { |
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// Tx is never destroyed
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rx.await.unwrap(); |
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}) |
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} |
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} |
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